Go SDK for KuCoin API

The detailed document https://docs.kucoin.com, in order to receive the latest API change notifications, please Watch this repository.

Install

go get github.com/Kucoin/kucoin-go-sdk

Usage

Choose environment

Create ApiService

Note

To reinforce the security of the API, KuCoin upgraded the API key to version 2.0, the validation logic has also been changed. It is recommended to create(https://www.kucoin.com/account/api) and update your API key to version 2.0. The API key of version 1.0 will be still valid until May 1, 2021.

// API key version 2.0
s :=  kucoin.NewApiService( 
	// kucoin.ApiBaseURIOption("https://api.kucoin.com"), 
	kucoin.ApiKeyOption("key"),
	kucoin.ApiSecretOption("secret"),
	kucoin.ApiPassPhraseOption("passphrase"),
	kucoin.ApiKeyVersionOption(ApiKeyVersionV2)
)

// API key version 1.0
s := kucoin.NewApiService( 
	// kucoin.ApiBaseURIOption("https://api.kucoin.com"), 
	kucoin.ApiKeyOption("key"),
	kucoin.ApiSecretOption("secret"),
	kucoin.ApiPassPhraseOption("passphrase"), 
)
// Or add these options into the environmental variable
// Bash: 
// export API_BASE_URI=https://api.kucoin.com
// export API_KEY=key
// export API_SECRET=secret
// export API_PASSPHRASE=passphrase
// export API_KEY_VERSION=2
// s := NewApiServiceFromEnv()

Debug mode & logging

// Require package github.com/sirupsen/logrus
// Debug mode will record the logs of API and WebSocket to files.
// Default values: LogLevel=logrus.DebugLevel, LogDirectory="/tmp"
kucoin.DebugMode = true
// Or export API_DEBUG_MODE=1

// Logging in your code
// kucoin.SetLoggerDirectory("/tmp")
// logrus.SetLevel(logrus.DebugLevel)
logrus.Debugln("I'm a debug message")

Examples

See the test case for more examples.

Example of API without authentication

rsp, err := s.ServerTime()
if err != nil {
    log.Printf("Error: %s", err.Error())
    // Handle error
    return
}

var ts int64
if err := rsp.ReadData(&ts); err != nil {
    // Handle error
    return
}
log.Printf("The server time: %d", ts)

Example of API with authentication

// Without pagination
rsp, err := s.Accounts("", "")
if err != nil {
    // Handle error
    return
}

as := kucoin.AccountsModel{}
if err := rsp.ReadData(&as); err != nil {
    // Handle error
    return
}

for _, a := range as {
    log.Printf("Available balance: %s %s => %s", a.Type, a.Currency, a.Available)
}

// Handle pagination
rsp, err := s.Orders(map[string]string{}, &kucoin.PaginationParam{CurrentPage: 1, PageSize: 10})
if err != nil {
    // Handle error
    return
}

os := kucoin.OrdersModel{}
pa, err := rsp.ReadPaginationData(&os)
if err != nil {
    // Handle error
    return
}
log.Printf("Total num: %d, total page: %d", pa.TotalNum, pa.TotalPage)
for _, o := range os {
    log.Printf("Order: %s, %s, %s", o.Id, o.Type, o.Price)
}

Example of WebSocket feed

Require package gorilla/websocket

go get github.com/gorilla/websocket github.com/pkg/errors

rsp, err := s.WebSocketPublicToken()
if err != nil {
    // Handle error
    return
}

tk := &kucoin.WebSocketTokenModel{}
if err := rsp.ReadData(tk); err != nil {
    // Handle error
    return
}

c := s.NewWebSocketClient(tk)

mc, ec, err := c.Connect()
if err != nil {
    // Handle error
    return
}

ch1 := kucoin.NewSubscribeMessage("/market/ticker:KCS-BTC", false)
ch2 := kucoin.NewSubscribeMessage("/market/ticker:ETH-BTC", false)
uch := kucoin.NewUnsubscribeMessage("/market/ticker:ETH-BTC", false)

if err := c.Subscribe(ch1, ch2); err != nil {
    // Handle error
    return
}

var i = 0
for {
    select {
    case err := <-ec:
        c.Stop() // Stop subscribing the WebSocket feed
        log.Printf("Error: %s", err.Error())
        // Handle error
        return
    case msg := <-mc:
        // log.Printf("Received: %s", kucoin.ToJsonString(m))
        t := &kucoin.TickerLevel1Model{}
        if err := msg.ReadData(t); err != nil {
            log.Printf("Failure to read: %s", err.Error())
            return
        }
        log.Printf("Ticker: %s, %s, %s, %s", msg.Topic, t.Sequence, t.Price, t.Size)
        i++
        if i == 5 {
            log.Println("Unsubscribe ETH-BTC")
            if err = c.Unsubscribe(uch); err != nil {
                log.Printf("Error: %s", err.Error())
                // Handle error
                return
            }
        }
        if i == 10 {
            log.Println("Subscribe ETH-BTC")
            if err = c.Subscribe(ch2); err != nil {
                log.Printf("Error: %s", err.Error())
                // Handle error
                return
            }
        }
        if i == 15 {
            log.Println("Exit subscription")
            c.Stop() // Stop subscribing the WebSocket feed
            return
        }
    }
}

API list

Run tests

# Add your API configuration items into the environmental variable first
export API_BASE_URI=https://api.kucoin.com
export API_KEY=key
export API_SECRET=secret
export API_PASSPHRASE=passphrase
export API_KEY_VERSION=2

# Run tests
go test -v

License

MIT